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我得到了谷歌Play开发者控制台上的堆栈跟踪它看起来像这样:什么可能导致此错误?
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.myapp.foo/de.myapp.foo.SecondActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at de.myapp.foo.SecondActivity.onCreate(SecondActivity.java:42)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
... 11 more
的问题是,我只知道有我SecondActivity
类的错误。但是我能做些什么来了解更多关于什么是确切原因?
代码在哪里? – nKn
你是否在AndroidManifest.xml中声明了第二个活动? – pedromss
@pedromss它不是'ActivityNotFoundException'它是一个'NullPointerException' – codeMagic